The thread looks more like a size 10 crochet cotton than perle cotton or embroidery floss to me. Just MHO.
I don't think it's perle cotton. It might be Knit Cro Sheen which comes in many colors and doesn't have the sheen or twist of perle cotton. Google Knit Cro Sheen for many sources. Note: I used to use it for lots of craft projects - makes great crocheted covers for wooden coat hangers, among other things.